<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <script type="text/javascript">
        	var abc = 1;
        	var bca = 2;
        	var def = "js基础"

        	console.log(typeof abc);//number  数值型
        	console.log(typeof def);//string  字符串型

        </script>
    </head>
    <body>
    </body>
</html>